G. Parente

Higher twists and αs(MZ) extractions from the NNLO QCD analysis of the CCFR data for the xF3 structure function

Abstract A detailed next-to-next-to-leading order (NNLO) QCD analysis is performed for the experimental data of the CCFR collaboration for the xF 3 structure function. Theoretical ambiguities of the results of our NNLO fits are estimated by application of the Pade resummation technique and variation of the factorization and renormalization scales. The NNLO and N 3 LO α s ( Q 2 ) MS -matching conditions are used. In the process of the fits we are taking account of twist-4 1/ Q 2 -terms. We found that the amplitude of the x-shape of the twist-4 factor is decreasing in NLO and NNLO, though some remaining twist-4 structure seems to retain in NNLO in the case when only statistical uncertainties are taken into account. The question of the stability of these results to the application of the [0/2] Pade resummation technique is considered. Our NNLO results for α s ( M Z ) values, extracted from the CCFR xF 3 data, are α s ( M Z )=0.118±0.002(stat)±0.005(syst)±0.003(theory) provided the twist-4 contributions are fixed through the infrared renormalon model and α s ( M Z )=0.121 +0.007 −0.010 (stat)±0.005(syst)±0.003(theory) provided the twist-4 terms are considered as free parameters.

NEXT-TO-NEXT-TO-LEADING ORDER QCD ANALYSIS OF THE REVISED CCFR DATA FOR XF3 STRUCTURE FUNCTION AND THE HIGHER TWIST CONTRIBUTIONS

Abstract We present the results of the next-to-next-to-leading order QCD analysis of the recently revised experimental data of the CCFR collaboration for the xF 3 structure function using the Jacobi polynomial expansion method. The effects of the higher twist contributions are included into the fits following the infrared renormalon motivated model. The special attention is paid to the checks of the predictive abilities of the infrared renormalon model and to the independent extractions of the x -dependent shape of the twist-4 contributions to the xF 3 structure function in the process of the leading order, next-to-leading order and next-to-next-to-leading order fits of the revised CCFR data. We stress that at the next-to-next-to-leading order the results for α s ( M Z ) turn out to be almost nonsensitive to the higher-twist terms. We obtain the following result α s NNLO ( M Z )=0.117±0.002(stat)±0.005(syst)±0.003(theory). The comparison of the outcomes of our next-to-leading order and next-to-next-to-leading order analysis indicate that the theoretical QCD uncertainties were underestimated in the process of the next-to-leading order determination of α s ( M Z ), made recently by the CCFR collaboration itself.We present the results of the next-to-next-to-leading order QCD analysis of the recently revised experimental data of the CCFR collaboration for the

Next to next-to-leading order QCD analysis of the CCFR data for xF3 and F2 structure functions of the deep inelastic neutrino - nucleon scattering

xF_3

The gluon distribution as a function of F2 and dF2dlnQ2 at small x. The next-to-leading analysis

structure function using the Jacobi polynomial expansion method. The effects of the higher twist contributions are included into the fits following the infrared renormalon motivated model. The special attention is paid to the checks of the predictive abilities of the infrared renormalon model and to the independent extraction of the

Order αs2 perturbative QCD corrections to the Gottfried sum rule

x

The NNLO QCD analysis of the CCFR data for xF3: Q2-dependence of the parameters

-shape of the twist-4 contributions to the

Measuring the BFKL pomeron in neutrino telescopes

xF_3

The QCD analysis of the revised CCFR data for xF3 structure function: the next-to-next-to-leading order and Padé approximants

structure function in the process of the leading order, next-to-leading order and next-to-next-to-leading order fits of the revised CCFR data. We stress that at the next-to-next-to-leading order the results for

Next-to-next-to-leading order fits to CCFR'97 xF3 data and infrared renormalons

\alpha_s(M_Z)

The NNLO QCD analysis of the CCFR data for χF3: is there still the room for the twist-4 terms?

turn out to be almost nonsensitive to the higher-twist terms. We obtain the following result